html,body{
    height: 100%;
    width: 100%;
}
.markbox {
    width: 100%;
    height: 100%;
    min-width: 1200px;
    min-height: 800px;
    background: rgb(223, 221, 221);
    display: flex;
    justify-content: center;
    align-items: center;

}
.innerbox{
    padding: 0px 20px;
    height: 780px;
    width: 1100px;
    background: white;
}
#mhead {
    width: 100%;
    min-width: 1100px;
    text-align: center;
}

#mhead span {
    font-size: 16px;
    margin: 0px 20px 0px 0px;
    display: inline-block;
    background: rgb(0, 150, 136);
}

#mhead input {
    margin: 20px 20px;
    height: 30px;
    line-height: 30px;
    font-size: 15px;
    width: 344px;
}

#mhead label {
    font-size: 18px;
    font-weight: bold;
}

#mhead button {
    font-size: 16px;
}